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阅读理解。 There is a house near the river. There lives a man in the house and there are a lot of fish in the river. There are some trees by the river. There are some apple trees and some banana trees. There often stay some monkeys. The monkeys often go there and eat some fruit. The man often fishes (钓鱼) in the river. When the man fishes, the monkeys throw some apples and bananas in the river. So the fish run away so that the man fishes no fish. In order to catch a fish, the man often keeps the monkeys away while he is fishing. 1. Is there a bridge over the river? [     ] A. Yes, there is. B. No, there isn't. C. The story doesn't tell us. D. No, there is. 2. Why do the monkeys often go there? [     ] A. Because there is much fish. B. Because there is a man. C. Because there are some fruit trees. D. Because they want to throw some apples in the river. 3. Does the man like the monkeys to go there? [     ] A. Yes, he does. B. No, he doesn't. C. He likes them very much. D. No, he don't. 4. Why can't the man catch any fish? [     ] A. Because the river is not deep. B. Because fish doesn't like his food. C. Because there is no fish in the river. D. Because the monkeys throw something in the river. 5. What does the man do at last? [     ] A. The man doesn't fish any more. B. The man goes to another river to fish. C. The man kills some monkeys. D. The man drives the monkeys away.
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【简答题】(1)根据磁感线方向,在下图中标出磁铁及小磁针的N、S极. (2)在通电螺线管左方有一小磁针,小磁针静止时的指向如下图所示,请在图中标出 电源的“+”、“一”极. (3)如下图所示的通电螺线管电路中,电流表的示数正常,请标出通电螺线管的N、s极.
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A.
100
B.
200
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500
D.
800
【简答题】(1)图所示,根据小磁针N极的指向标出磁体的磁极和磁感线的方向; (2)请根据图甲中小磁针静止时的指向,在图乙中标出电磁铁的磁极,并在图中画出导线的绕线。 (3)某同学想利用电磁继电器制成一个温度自动报警器,实现对温控箱内的温度监控.用如图丙所示带金属触丝的水银温度计和电磁继电器组装成自动报警器,正常情况下绿灯亮,当温控箱内温度升高到一定温度时,红灯亮(绿灯熄灭)。请按此要求连接电路(红、绿灯的额...
【简答题】(1)请你完成如图1的光路图. (2)如图2所示,根据小磁针静止时的指向,标出电源的正、负极及通电螺线管的N、S极. (3)请画出图3中拉开右边眼镜脚的力F的力臂.
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【简答题】(1)如图1所示,根据小磁针静止时N,S极的指向,可判断出通电螺线管的A端为______极,电源的a端为______极. (2)请画出图2中与入射光线对应的折射光线的大概位置. (3)请画出图3中小鸟所受重力的示意图(O为重心)
【简答题】(1)如图所示,根据小磁针静止时N、S极的指向,可判断出通电螺线管的A端为______极,电源的a端为______极。 (2)请画出图中与入射光线对应的折射光线的大概位置。 (3)请画出图中小鸟所受重力的示意图(O为重心)。
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